Ejector pump



Dec. 3, 1929. H. .1. KRoscov EJECTOR PUMP Filed March 5, 1927 2 Sheets-Sheet A TTORNE Y Dec? 3, 1929. H. J. KRoscov EJECTOR PUMP Filed March 5. 1927 2 Sheets-Sheet 2 A TT ORNE Y NVENTOR mv MKM MM .lll-.I

Patented Dec. 3, 1929 UNITED STATES IEIIEZN'IBYA J. KROSCOV, 0F MILWAUKEE, WISGONSIN EJECTOR PUMP Application led March 5,

This invention relates in general to pumps, and more particularly to pressure operated pumps for use in wells. One object of the infvention is to provide a pump of this character in which air or other gas under pressure is utilized for raising oil or other liquid from the well.

Another object of the invention is to provide a pressure operated well pump of this lo character providing a novel and effective means'of utilizingl the air or gas pressure to effectively entrain or lift the oil or liquid ina manner precluding stalling or down flow or back flow of the oil or liquid.

In carrying out the present invention a pump is provided which consists of an outer string of tubing which extends down through the well casing and provides a conduitk for the motive fluid which is usually compressed air, although it may be any suitable gas or fluid pressure medium. A How line for the oil or other liquid pumped from the well extends axially through the outer tubing. At the bottom of the well the body portion of the pump is provided and consists of an outer casing which has an external diameter uniform with that of the other tubing or pressure conduit. This pump casing is submerged in the oil or other liquid to be pumped and has screened inlets permitting the oil or liquid to flow thereinto. Within this pump casing a passage is provided which has free and open communication with the pressure conduit and which leads therefrom to an up- Wardly directed jet. The jet projects into an oil or liquid discharge passage formed in the pump casing and communicates with the flow line. Between the screened inlets of the pump casing and the jet an automatically closing back pressure valve is provided which, though normally open, serves to prevent back flow or down flow of the oil from the flow line by closing automatically when 5 the load on the jet becomes so great as to tend to cause back flow, or when back iow or down flow tends to occur for any other reason during the operation of the pump. In the flow line any desirable number of booster jets may be provided to maintain a continuous or Con- 1927. Serial No. 172,952.

stant and uniform discharge of the oil or the liquid.

Other objects and advantages reside in certainv novel features of the construction, arrangement and combination of parts which will be hereinafter more "fully described and particularly pointed out in the appended claims, reference being had to the accom- .panying drawings forming a part -of. this specification, and in which: ou

\ Figure 1 is a fragmentary view in transverse vertical section showing an oil well pump embodying the present invention, parts being shown in velevation for the sake of illustration.

Figure 2 is a fragmentary sectional view 65 on line 2-2 of Figure 1.

Figures 3, 4 and 5 are views in horizontal section-on lines 3 3, 4 4, and 5-5 respectively of Figure 1.

Figure 6 is a view similar to Figure 1, 10 showing another embodiment of the invention.

Figure 7 is a fragmentary sectional view on line 7--7 of Figure 6, and

Figures 8 and 9 are views in horizontal sec- 75 tion on line 8-8 and 9-9 respectively of Figure 6.

Referring to the drawings, and more specially to Figures l to 5 inclusive, numeral 1 designates the well casing in which a pump so embodying the present invention is positioned. The pump comprises an outer string tubing 2 made up of any suitable number of sections coupled together in the usual or in an approved manner. A source of air under pressure or of other Huid pressure medium is provided and is shown for the sake of simplicity in illustration as comprising a pressure conduit 3 connected to the upper end o the tubing 2 by coupling head 4. Within the 90 outer tubing 2 a flow line 5 is provided and consists of a string of tubing made up of a number of sections suitably connected together. The flow line 5 extends "through a packing nut 6 provided in the coupling head 95 u 4 and connects with any suitable storage means (not shown).

At the bottom of the well a pump casing 7 is provided and preferably has the external form of a cylinder, the external diameter of the casingv7 being the same or substantially the saine as that of the tubing 2 whereby it is adapted to fit within an ordinary well casing. As shown in Figure 1, the casing 7 is slightly larger than the tubing 2, and is coupled to the tubing 2 by coupling sleeve 8. The upper end of the casing 7 is open and freely communicates with the interior of the tubing 2. The lower end of the casing 7 is closed as indicated at 9. Within the casing 7 a passage 10 is provided and is defined by wall 11 shown as integral with the casing 7. For the major portion of its extent this passage 10 parallels the periphery of the casing 7, but at its upper end it widens out and freely communicates with the interior of the outer tubing 2. The widened or enlarged upper portion of the passage 10 is defined by continuation 11a of the wall 11 which curves transversely across the interior of the casing 7 and is integral with or suitably connected to the inner periphery of the casing 7. This portion 11a of the wall 11 constitutes a partition which completely separates the interior of the casing 7 from the interior of the con-r duit 2 except for such communication as is had through the passage 10. The passage 10 at the lower end of the casing curves across the bottom of the same as indicated at 10a, this curving portion 10 of the passage 10 being defined by the bottom 9 and by a wall 11b which is a continuation of the wall 11 and which is integral with or suitably connected to the structure of the casing 7 as indicated in Figure 2.- A vertically extending nozzle 12 is formed at the end of the portion 10u of the passage 10 and this nozzle 12 discharges into a discharge passage- 13 also provided within Athe casing 7 and defined by a wall 14 integral with or suitably connected with the casing 7 as'shown in Figure 3. A discharge nipple 15 is formed as a continuation of the wall 14, and this discharge nipple, after extending through the partition 11a is coupled as at 16 to the lower end of the flow line 5. The structure described also serves to define within the casing 7 an inlet chamber 17 having screened inlet openings 18 to permit the oil or other liquid to flow freely therein. The oil or liquid passing into the inlet chamber 17 flows past a valve seat 18 down into a valve chamber 20 and then around a lip 14a to the region of the nozzle 12.v

In the chamber 20 a back pressure valve 21 is provided and is shown as having the form of a disc pivotally connected as at 22 to the lip 14a. A stop lug 23 integral with the lip 14a limits the opening movement of the valve 21.

` In flow line 5 any suitable number of booster units or auxiliary jets may be provided, and, as shown in Flgure 1, preferably comprises an upwardly directed nozzle 25, which may be formed integral with or suitably connected to the flow line 5. rlhe upper end of the jet 25'is open, and the lower end thereof curves laterally as at 26 and has free and open connection with the air collecting sleeve 27. The air collecting sleeve 27 encircles the fiow line 5 and it has its upper end open. The lower end of the sleeve 27 is connected as at 28 with the outer periphery of the flow line whereby to close the lower end of the sleeve. The flow line 5 is formed with an opening 29 which affords communication between the space defined between the sleeve 27 and the flow line 5 and the interior of the nozzle 25.

In operation with this embodiment of the invention compressed air or the fluid pressure is supplied to the fluid pressure conduit 3 and flows down through the pressure conduit constituted of tubing 2. The air stream flowing through the conduit passes with increased velocity into the passage l() due to the narrowing of the same, and at the nozzle 12 the velocity of the air stream is further increased. Thus a jet of highvelocity issues from the nozzle 12 and entrains the oil or other liquid surrounding the nozzle, carries it up through passage 14 and nipple 15 and up through flow line 5. The fiow of the oil up through the flow line is maintained by the action of the booster jets which issue from the nozzles 25. In this connection it is to be understood that some of the air flowing down through the con-v duit 2 is picked up by the sleeves 27 and passes into the nozzles 25 and issues from these nozzles in the form of upwardly directed jets which act on the oil or liquid of the flow line to force the same upward. Should the oil tend to flow back into the inlet chamber past the valve 21 it will automatically close the valve 21, and thus back flow will be prevented, but the nozzles continue to operate to carry the oil out of the flow line, thus relieving the pump of load intending to open the valve 21 and draw the oil from the inlet chamber and raise it up above the ground.

Figures 6 to 9 inclusive illustrate a modification of the pump herein above described. In this modification the pump casing is designated at 30 and has a wall 31 therein defining a passage 32 which communicates with the pressure conduit at its upper end and with a nozzle 32 at its lower end, the walls of the nozzle merging into the casing and into the wall 31. The nozzle 32 projects up into a discharge passage 33'which the wall 31 also defines with` in the casing 30. `At its -upper end this discharge passage 33 communicates with the interior of a nipple 34, the lower end of which merges into the casing' 30 and into the Wall 31, and the upper ,end of it is connected as at 35 at the lower end of the flow line 5. In this embodiment of the invention a valve chamber 36 is provided below the nozzle 32 and is threaded on to the lower end of the pump` casing 3() as indicated at 37. The valve casing has its periphery perforated as at l38 and also has a perforated bottom 39 to provide a screened inlet thereto.

Between the valve chamber and the lower end of the casing 30 a valve seat 40 is provided and with this valve seat 40 a back pressure valve 41, similar to the back pressure valve 21 coacts, the valve 41 being pivotally mounted as at 42 on the lower end of the casing 30. In this form of the invention it is proposed to have the valve 41 controlled partly by pressure and partly by a ball float 43, the float 43 being disposed in the valve chamber and having trunnions 44 pivotally connected to the lower end of a yoke 45 which has its upper end pivotallyconnected as at 46 with the valve 41. Thus the valve 41 is controlled not only by the pressure acting upon the same, but also the same degree by the fioat 43. Thus, when the valve chamber is filled with oil the buoyancy of the float 43 tends to open the valve 41, whereas, when the supply of oil through the valve chamber is low or exhausted, the loat 43 falls and tends to close the valve 41. In other respects, this form of invention operates substantially in the same manner as the form illustrated in Figures 1 to 5 and hereinabove described.

It is to be understood in connection with both forms of the invention, and especially in connection with the pump casing and its passages used in both forms that while the various walls and parts are shown as integral, they may be made separate or in sections and welded or otherwise suitably secured together.

The invention claimed is:

1. A well pump of the character described comprising a pressure conduit, a flow line extending there through, a pump casing connected to the lower end of the pressure conduit, a jet in said pump casing receiving the pressure from said pressure conduit, a discharge passage in said pump casin receiving the jet and connected with'the ow line,

anda booster jet arranged in the low line above the pump casing, and comprising a collecting sleeve surrounding the flow line and located in the pressure conduit, and a nozzle `positioned within the flow line and communicating with thecollecting sleeve.

2. A well pump of the character described comprising a pressure conduit, a flow line extending therethrough, a pump casing at the lower end of the pressure conduit, said pump casing having a closed bottom and also having a pressure passage communicating with the pressure conduit and extending downwardly through the casing and transverselyacross the closed bottom thereof, a jet in said pump forming a continuation ofthe pressure passage, a discharge passage receiving said 'jet and extending upwardly through the casing, and a discharge nipple formed as a continuation of the discharge passage and extending across the pressure passage and connected to the flow line, said casing having peripheral inlets communicating with the lower end of the discharge passage.

3. IA well pump of the character described comprising a pressure conduit, a flow line extending therethrough, a pum casing at the lower end of the pressure con uit, said pump casing having a closed bottom and also having a pressure passage communicating with the pressure conduit and extending downwardly through the casing'and transversely across the closed bottom thereof, a jet in said pump forming a continuation of the pressure passage, a discharge passage receiving said jet and extending upwardly through the casing, a discharge nipple formed as a continuation of the discharge passage and extending across the pressure passage and connected to the flow line, said casing having peripheral inlets above the bottom thereof, and having a relatively large inlet chamber and a relatively large valve chamber, there being a restricted port between said chambers, the valve chamber'communicating with `the-lower end of the discharge passage and a pressure operated valve in said valve chamber adapted to engage the seat under the influence of back flow to prevent liquid from flowing from the ilow line back into the inlet chamber, the valve occupying but a small portion of the valve chamber in its open position to provide for a substantially unobstructedcommunication between the inlet chamber and the discharge passage at such time.

4. A well pump of the character described,

comprising a pump casing having av closed bottom and also having'a pressure passage offset from its center and extending downwardly therethrough and across the bottom thereof, an upwardly directed jet communicating with the pressure passage and receiving its supply of pressure therefrom, a discharge passage having its lower end open and receiving said jet, said discharge passage being oset from the center of the casing in opposed relation to the pressure passage and extending upwardly through the casing, said casing having an inlet chamber between said passages communicating with the lower open/ end of the discharge passage, said casing also having peripheral inlets to-said inlet chamber located intermediate said passages, means for carrying ofi' the discharge from said discharge passage and means for supplying iiuid pressure to said pressure passage. I

5. A well pumpof the character described including a pump casing having spaced longitudinally extending pressure and discharge passages and having an inlet lchamber be-y tween said passages and peripheral inlets te said chamber, said discharge passage having an opening communicating with the inlet chamber, a jet communicating with the pressure passage and operatively related to the discharge passage, there being a valve chamber between the inlet chamber and the region of the 'et and a back pressure valve in said valve chamber adapted to close under the iniucnce ofback How, said valve being so disposed in open position as to leave an unobstructed passage for the liquid through the valve chamber.

6. A well pump of the character described including a pump casing having a closed bottom and also having spaced longitudinally extending pressure and discharge passages with a liquid inlet chamber between said passages, said casing being provided with peripheral liquid inlets leading from the eX- terior into said liquid inlet chamber, said discharge passage having an opening communieating With the inlet chamber, a jet communicating with and receiving pressure from the pressure passage and discharging into the discharge passage in the region Where the opening of the discharge passage communi! cates With the liquid inlet chamber, a flow line communicating with the discharge passage, and a fluid pressure supply line communicating With the pressure passage.

In Witness whereof, I hereto aiiix my signature.

HENRY J. KROSCOV. 

